When we get oxygen os 11 for oneplus 7t pro
Probably January as the Nord will get it next.
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Oxygen os 11 is still under development for your device model by OnePlus. It will be released when it is ready.
There is no ETA.
Please read and use this thread for further discussion
Deep Dive - OnePlus Band Blood Oxygen Saturation Monitoring
by Leo X., 2021-01-18